New functions introduced, several rewrites:
- New function verifyExpertSettings() added which checks if the admin is aware
of altering so-called expert settings, which may raise malfuntion in your
mailer
- Several rewrites on XHTML
- More double quotes converted to single
- Other smaller issues fixed (e.g. non-working deletion of bonus mails)
- TODOs.txt updated

Extension ext-repair extended, outdated calls DEBUG_LOG() fixed:
- Extension ext-repair does now "repair", say check, for missing translation
entries. This tool should be used by the translation maintainer to find all
missing language strings.
- Old calles of DEBUG_LOG() fixed to logDebugMessage()